Malicious PDF — malware analysis report

Static analysis result for SHA-256 d977e6c33e609978…

MALICIOUS

PDF

118.1 KB Created: 2021-03-24 11:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0970c262a5bd307c9c1c529761f03b57 SHA-1: 51fe00e735815ea315408be194142f08f79a6c0d SHA-256: d977e6c33e609978eb2240c88cb7e5763cc5122b1dbbfb9f6e4efe8e73ac6721
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to the authoring application and a keyword that might be part of a social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/wix?keyword=bristol+borough+american+dart+league PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375896/normal_5fedf65b0bd15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485318/normal_6027fc252d6fa.pdfIn PDF document text
    • https://muverope.weebly.com/uploads/1/3/0/7/130776407/8592156.pdfIn PDF document text
    • http://design-kvartira.info/83474270812nn6uj.pdfIn PDF document text
    • https://serogewuf.weebly.com/uploads/1/3/4/6/134615077/wozutizoro-nuromogirepoko.pdfIn PDF document text
    • http://complerbnp.com/interior_design_programs_in_floridalkyeq.pdfIn PDF document text
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/pesoledoguwevili.pdfIn PDF document text
    • http://bizbize-yeteriz.org/emulator_for_pc_windows_xp6ub6k.pdfIn PDF document text
    • http://olipaka.xyz/xenyx_qx1202usb_driverjn222.pdfIn PDF document text
    • http://sethel.xyz/ensayos_sobre_la_problematica_curricular_de_angel_diaz_barrigalwdzx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fe0a8571b654.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_366a164758a34f86b67b1df2a3376cff.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_ba60fe583e4048b89e515cd6b7df5ad1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/nuvunobazukobukezaw.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/aladdin_2019_english_subtitle.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/jamajararovaf.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/jugubiwikilejara.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_b77aef01da50445c9c3387494378bef4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/dulces_mentiras_amargas_verdades_4_google_drive.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA4 5544 bytes
SHA-256: aea3a6ebd15a1bf164db9a3ab68b864bd2a1877fa85cfef2a5f68e69653264c0
font_01_sfnt_off0001a24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A24D 12068 bytes
SHA-256: 8e60b6d4a2fdc6fefb805a4f8ff89ae1b1957432dfa56d5198d21da36f05f710

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